I have not read a “real” book in several years.
For me it is my eyesight. With e books I can enlarge the print to make it more readable.
Besides Amazon there are several free sources for ebooks - I don’t even have to leave the house to find more to read.
That's the reason that my wife took to the Kindles like a duck to water. Before that, I bought her a lapdesk with a magnifier attached so that she could use that to read her books. Now, she just adjusts the font and can read to her heart's content.
We spend every evening reading together, at least two and a half hours .. usually 7 PM to 9:30 PM .. and, by the time that we get ready for bed, my blood-pressure is much much lower (usually at the level of your average carrot), and I am relaxed and ready to sleep. Great stuff!